/* 基础样式重置 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
        }
        
        body {
            background-color: #f5f7fa;
            color: #333;
        }
        
        /* 头部容器 - 只固定顶部导航，不包含二级菜单 */
        .header-wrapper {
            background-color: #fff;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
            position: sticky;
            top: 0;
            z-index: 999;
        }
        
        .container {
            max-width: 1440px;
            margin: 0 auto;
            padding: 0 40px;
        }
        
        /* 顶部导航 */
        .top-nav {
            height: 90px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        
        /* Logo样式 */
        .logo {
            display: flex;
            align-items: center;
            text-decoration: none;
        }
        
        .logo-icon {
            width: 44px;
            height: 44px;
            background-color: #334d61;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 22px;
            font-weight: bold;
        }
        .logo img{max-height:68px;}
        
        .logo-text {
            font-size: 24px;
            font-weight: bold;
            color: #1D2129;
            margin-left: 12px;
        }
        
        /* 主导航 */
        .main-nav {
            display: flex;
            list-style: none;
            margin-left: 60px;
        }
        
        .main-nav li {
            margin: 0 20px;
            position: relative;
        }
        
        .main-nav a {
            text-decoration: none;
            color: #4E5969;
            font-size: 16px;
            font-weight: 500;
            padding: 35px 0;
            display: inline-block;
            transition: color 0.3s ease;
            position: relative;
        }
        
       /* 主导航菜单 */
.main-nav {
    display: flex;
    list-style: none;
    margin-left: 60px;
    padding: 0; /* 确保没有默认内边距 */
}

.main-nav li {
    margin: 0 20px;
    position: relative;
}

.main-nav li a {
    text-decoration: none;
    color: #666; /* 使用具体颜色值测试，替代变量 */
    font-size: 16px;
    font-weight: 500;
    padding: 35px 0;
    display: inline-block;
    position: relative;
}

/* 激活状态 - 直接针对li.active */
.main-nav li.active a {
    color: #2c3e50; /* 使用具体颜色值测试 */
}

/* 悬停状态 */
.main-nav li a:hover {
    color: #2c3e50;
}

/* 下划线效果 */
.main-nav li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background-color: #2c3e50; /* 使用具体颜色值 */
    border-radius: 3px 3px 0 0;
    transition: width 0.3s ease;
}

/* 激活状态下划线 */
.main-nav li.active a::after {
    width: 100%;
}
        
        /* 右侧功能区 */
        .right-controls {
            display: flex;
            align-items: center;
        }
        
        /* 搜索按钮和搜索框 */
        .search-btn {
            background: none;
            border: none;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            color: #4E5969;
            transition: all 0.3s ease;
            margin-right: 15px;
        }
        
        .search-btn:hover {
            background-color: #f0f5f9;
            color: #334d61;
        }
        
        .search-icon {
            width: 20px;
            height: 20px;
            position: relative;
        }
        
        .search-icon::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 14px;
            height: 14px;
            border: 2px solid currentColor;
            border-radius: 50%;
        }
        
        .search-icon::after {
            content: '';
            position: absolute;
            bottom: 0;
            right: 0;
            width: 8px;
            height: 2px;
            background-color: currentColor;
            transform: rotate(45deg);
        }
        
        /* 搜索弹出框 */
        .search-popup {
            position: absolute;
            top: 90px;
            right: 40px;
            width: 380px;
            background-color: #fff;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
            padding: 20px;
            transform-origin: top right;
            transform: scale(0.9);
            opacity: 0;
            pointer-events: none;
            transition: all 0.3s ease;
            z-index: 1000;
        }
        
        .search-popup.active {
            transform: scale(1);
            opacity: 1;
            pointer-events: auto;
        }
        
        .search-input-container {
            position: relative;
        }
        
        .search-input {
            width: 100%;
            padding: 12px 20px 12px 40px;
            border: 1px solid #E5E6EB;
            border-radius: 6px;
            font-size: 14px;
            outline: none;
            transition: all 0.3s ease;
        }
        
        .search-input:focus {
            border-color: #334d61;
            box-shadow: 0 0 0 2px rgba(51, 77, 97, 0.2);
        }
        
        .search-input-icon {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            color: #86909C;
        }
        
        .search-submit {
            position: absolute;
            right: 12px;
            top: 50%;
            transform: translateY(-50%);
            background-color: #334d61;
            color: white;
            border: none;
            width: 28px;
            height: 28px;
            border-radius: 4px;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }
        
        .search-submit:hover {
            background-color: #283c4d;
        }
        
        /* 用户头像和下拉菜单 */
        .user-menu {
            position: relative;
        }
        
        .user-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: #f0f2f5;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #4E5969;
            cursor: pointer;
            transition: all 0.3s ease;
            border: 2px solid transparent;
        }
        
        .user-avatar:hover {
            background-color: #e8f3f9;
            color: #334d61;
            border-color: rgba(51, 77, 97, 0.2);
        }
        
        .user-icon {
            width: 20px;
            height: 20px;
            position: relative;
        }
        
        .user-icon::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background-color: currentColor;
        }
        
        .user-icon::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 16px;
            height: 12px;
            border: 2px solid currentColor;
            border-radius: 50% 50% 0 0;
            border-bottom: none;
        }
        
        /* 用户下拉菜单 */
        .user-dropdown {
            position: absolute;
            top: 40px;
            right: 0;
            width: 280px;
            background-color: #fff;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
            padding: 15px 0;
            transform-origin: top right;
            transform: scale(0.9);
            opacity: 0;
            pointer-events: none;
            transition: all 0.3s ease;
            z-index: 1000;
        }
        
        .user-menu:hover .user-dropdown {
            transform: scale(1);
            opacity: 1;
            pointer-events: auto;
        }
        
        .dropdown-header {
            padding: 0 20px 10px;
            margin-bottom: 10px;
            border-bottom: 1px solid #F2F3F5;
        }
        
        .dropdown-header p {
            font-size: 14px;
            color: #86909C;
        }
        
        .auth-buttons {
            display: flex;
            flex-direction: column;
            gap: 10px;
            padding: 0 20px 15px;
            border-bottom: 1px solid #F2F3F5;
        }
        
        .auth-btn {
            padding: 10px 15px;
            border-radius: 6px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.3s ease;
            border: none;
            text-align: center;
        }
        
        .login-btn {
            background-color: #f0f5f9;
            color: #334d61;
        }
        
        .login-btn:hover {
            background-color: #e6eaef;
        }
        
        .register-btn {
            background-color: #334d61;
            color: white;
        }
        
        .register-btn:hover {
            background-color: #283c4d;
        }
        
        .third-party-login {
            padding: 15px 20px;
        }
        
        .third-party-title {
            font-size: 13px;
            color: #86909C;
            margin-bottom: 10px;
            text-align: center;
        }
        
        .social-buttons {
            display: flex;
            justify-content: center;
            gap: 15px;
        }
        
        .social-btn {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            border: none;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .wechat-btn {
            background-color: #07C160;
            color: white;
        }
        
        .qq-btn {
            background-color: #12B7F5;
            color: white;
        }
        
        .weibo-btn {
            background-color: #E6162D;
            color: white;
        }
        
        .social-btn:hover {
            transform: translateY(-2px);
        }
        
        /* 二级菜单区域 - 关键修改：移除固定定位，改为普通流元素 */
        .secondary-nav {
            background-color: #fff;
            border-top: 1px solid #F2F3F5;
            /* 移除固定定位相关属性 */
            position: static;
            top: auto;
            z-index: auto;
            box-shadow: none;
        }
        
        .secondary-nav-inner {
            padding: 25px 0;
        }
        
        .nav-modules {
            display: flex;
            justify-content: space-between;
        }
        
        .nav-module {
            display: flex;
            flex: 1;
        }
        
        /* 分组图标和标题 */
        .module-icon-container {
            width: 58px;
            text-align: center;
            margin-right: 20px;
        }
        
        .module-big-icon {
            width: 58px;
            height: 58px;
            background-color: #f0f5f9;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #334d61;
            font-size: 28px;
            margin-bottom: 8px;
        }
        
        .module-title {
            font-size: 14px;
            color: #1D2129;
            font-weight: 500;
        }
        
        /* 二级菜单样式 */
        .module-menu {
            display: flex;
            flex-wrap: wrap;
            gap: 10px 20px;
            padding-top: 8px;
        }
        
        .module-menu a {
            text-decoration: none;
            color: #4E5969;text-align: center;
            font-size: 14px;
            transition: all 0.3s ease;
            display: inline-block;
            padding: 6px 10px;
            border-radius: 4px;
        }
        
        .module-menu a:hover {
            color: #334d61;
            background-color: #f0f5f9;
        }
        
        /* 第一个和第三个模块 - 4个菜单 */
        .module-first .module-menu {
            max-width: 280px;
        }
        
        .module-first .module-menu a,
        .module-third .module-menu a {
            width: calc(50% - 10px);
        }
        
        /* 中间模块 - 6个菜单 */
        .module-second {
            margin: 0 40px;
        }
        
        .module-second .module-menu {
            max-width: 420px;
        }
        
        .module-second .module-menu a {
            width: calc(33.333% - 13.333px);
        }

        /* 文库模块样式 */
        .document-library {
            background-color: #fff;
            margin: 20px auto;
            border-radius: 12px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
        }

        .document-library .container {
            padding: 24px;
        }

        /* Tab导航 - 调整为居左，选项卡之间有间隙 */
        .tab-nav {
            display: flex;
            align-items: center;
            border-bottom: 1px solid #F2F3F5;
            padding-bottom: 12px;
        }

        .tab-container {
            display: flex;
            gap: 20px; /* 选项卡之间的间隙 */
            margin-right: auto; /* 让选项卡居左 */
        }

        .tab {
            font-size: 16px;
            color: #4E5969;
            cursor: pointer;
            padding: 6px 18px;
            position: relative;
            transition: color 0.3s ease;
        }

        .tab:hover {
            color: #334d61;
        }

        .tab.active {
            color: #334d61;
        }

        .tab.active::after {
            content: '';
            position: absolute;
            bottom: -12px; /* 覆盖底部边框 */
            left: 0;
            width: 100%;
            height: 3px;
            background-color: #334d61;
            border-radius: 3px 3px 0 0;
        }

        .more-link {
            font-size: 14px;
            color: #334d61;
            text-decoration: none;
            transition: color 0.3s ease;
            margin-left: auto; /* 让更多链接居右 */
            padding: 6px 0;
        }

        .more-link:hover {
            color: #283c4d;
        }

        /* Tab内容区 */
        .tab-content {
            display: none;
            margin-top: 20px;
        }

        .tab-content.active {
            display: block;
        }

        /* 文档网格布局 - 5个一排 */
        .document-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 24px;
        }

        /* 文档卡片 */
        .document-card {
            background-color: #f9fbff;
            border-radius: 8px;
            padding: 16px;
            text-align: center;
            transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        }

        .document-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.12);
        }

        .card-cover {
            position: relative;
            margin-bottom: 16px;
        }

        .card-cover img {
            width: 100%;
            height: 320px;
            object-fit: cover;
            border-radius: 6px;
        }

        /* 文档类型标识 */
        .doc-type {
            position: absolute;
            bottom: 12px;
            right: 12px;
            background-color: #fff;
            border: 1px solid #E5E6EB;
            border-radius: 4px;
            padding: 4px 8px;
            font-size: 12px;
            color: #334d61;
            font-weight: 500;
        }

        .doc-type.pdf {
            background-color: #E6162D;
            color: #fff;
            border: none;
        }

        .doc-type.excel {
            background-color: #00B050;
            color: #fff;
            border: none;
        }

        /* 文档标题 */
        .card-title {
            font-size: 16px;
            color: #1D2129;
            font-weight: 500;
            margin-bottom: 12px;
            line-height: 1.4;
            height: 44px; /* 两行文本高度 */
            overflow: hidden;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
        }

        /* 元信息 */
        .card-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: #86909C;
            font-size: 14px;
        }

        .access-type {
            color: #E6162D; /* VIP颜色 */
            font-weight: 500;
        }

        .access-type.free {
            color: #00B050; /* 免费颜色 */
        }

        .view-count {
            color: #4E5969;
        }
        
        /* 主体布局 */
        .main-container {
            display: grid;
            grid-template-columns: 320px 1fr 320px;
            gap: 30px;
            max-width: 1440px;
            margin: 30px auto;
            padding: 0 40px;
            height: 650px;
        }
        
        .left-column, .middle-column, .right-column {
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        
        .left-column, .right-column {
            gap: 20px;
        }
        
        .middle-column {
            padding: 25px;
            background: #fff;
            border-radius: 12px;
            box-shadow: 0 6px 18px rgba(0,0,0,0.08);
            overflow-y: auto;
        }
        
        /* 左侧列 - 轮播 */
        .carousel-wrapper {
            position: relative;
            height: 380px;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 6px 18px rgba(0,0,0,0.12);
        }
        .carousel-slides {
            display: flex;
            width: 100%;
            height: 100%;
            transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .slide {
            flex: 0 0 100%;
            position: relative;
        }
        .slide img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .slide-title {
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            padding: 16px 20px;
            background: linear-gradient(180deg, rgba(0,0,0,0) 0%, rgba(0,0,0,0.6) 100%);
            color: #fff;
            font-size: 16px;
            line-height: 1.4;
        }
        
        /* 轮播控制按钮 */
        .carousel-controls {
            position: absolute;
            top: 50%;
            width: 100%;
            display: flex;
            justify-content: space-between;
            padding: 0 20px;
            transform: translateY(-50%);
            z-index: 2;
        }
        .carousel-controls button {
            background: rgba(255,255,255,0.8);
            border: none;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            cursor: pointer;
            font-size: 18px;
            transition: all 0.3s ease;
            box-shadow: 0 2px 8px rgba(0,0,0,0.15);
        }
        .carousel-controls button:hover {
            background: #fff;
            transform: scale(1.05);
        }
        
        /* 轮播分页点 */
        .carousel-dots {
            position: absolute;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            gap: 10px;
            z-index: 2;
        }
        .carousel-dots .dot {
            width: 12px;
            height: 12px;
            background: rgba(255,255,255,0.4);
            border-radius: 50%;
            cursor: pointer;
            transition: background 0.3s ease, transform 0.3s ease;
        }
        .carousel-dots .dot.active {
            background: #fff;
            transform: scale(1.2);
        }
        
        /* 文件汇总 */
        .file-summary {
            background: #fff;
            padding: 18px;
            border-radius: 12px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        .file-summary h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 12px;
            color: #1D2129;
        }
        .file-nav {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 8px;
            flex-grow: 1;
            align-content: start;
        }
        .file-nav button {
            background: #f0f5f9;
            border: none;
            padding: 9px;
            border-radius: 6px;
            cursor: pointer;
            font-size: 14px;
            color: #334d61;
            transition: all 0.3s ease;
        }
        .file-nav button:hover {
            background: #e6eaef;
            transform: translateY(-2px);
        }
        
        /* 中间列 - 文章排版 */
        .article-item {
            margin-bottom: 30px;
            border-bottom: 1px solid #f2f3f5;
            padding-bottom: 20px;
        }
        .article-item:last-child {
            margin-bottom: 0;
            border-bottom: none;
            padding-bottom: 0;
        }
        .article-item h2 {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 12px;
            color: #1D2129;
            line-height: 1.6;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 100%;
        }
        .meta {
            font-size: 14px;
            color: #86909C;
            margin-bottom: 12px;
            line-height: 1.8;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .sub-list {
            list-style: none;
            padding-left: 0;
        }
        .sub-list li {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 14px;
            color: #4E5969;
            margin-bottom: 7px;
            line-height: 1.8;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .sub-list li span {
            color: #86909C;
            margin-right: 15px;
            white-space: nowrap;
        }
        
        /* 右侧列 */
        .action-buttons {
            background: #fff;
            padding: 18px;
            border-radius: 12px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
        }
       .big-btn {
  width: 100%;
  padding: 13px;
  background: #334d61;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  cursor: pointer;
  margin-bottom: 10px;
  transition: all 0.3s ease;
  display: block; /* 新增这一行，确保宽度生效 */
  text-align: center; /* 可选：让文字居中，保持按钮原有视觉效果 */
  text-decoration: none; /* 可选：去除链接默认下划线 */
}

        .big-btn:hover {
            background: #283c4d;
            transform: translateY(-2px);
        }
        .action-buttons p {
            font-size: 14px;
            color: #86909C;
            text-align: center;
            margin-bottom: 15px;
            line-height: 1.6;
        }
        .action-buttons p:last-of-type {
            margin-bottom: 0;
        }
        
        /* 悬赏轮播区 */
        .bounty-carousel {
            background: #fff;
            padding: 18px;
            border-radius: 12px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        .bounty-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 12px;
        }
        .bounty-carousel h3 {
            font-size: 18px;
            font-weight: 600;
            color: #1D2129;
            margin: 0;
        }
        .bounty-scroll {
            height: calc(100% - 24px);
            overflow: hidden;
            position: relative;
        }
        .bounty-list {
            list-style: none;
            padding: 0;
            margin: 0;
            position: absolute;
            width: 100%;
            transition: transform 0.5s ease-in-out;
        }
        .bounty-list li {
            padding: 14px 0;
            border-bottom: 1px solid #f2f3f5;
        }
        .bounty-list li:last-child {
            border-bottom: none;
        }
        .bounty-title {
            display: block;
            font-size: 14px;
            color: #4E5969;
            line-height: 1.6;
            margin-bottom: 5px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .bounty-meta {
            font-size: 12px;
            color: #86909C;
        }
        .bounty-meta em {
            color: #E6162D;
            font-style: normal;
        }
        
        /* 精选热推+热点问题模块 */
        .article-section {
            background-color: #fff;
            margin: 40px auto;
            border-radius: 12px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
            overflow: hidden;
        }

        .article-wrapper {
            display: flex;
            gap: 30px;
            padding: 30px;
            /* 确保容器高度一致 */
            height: 100%;
        }

        /* 左右面板高度强制一致 */
        .article-panel {
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        /* 左侧面板（宽度更大） */
        .left-panel {
            flex: 3;
        }

        /* 右侧面板 */
        .right-panel {
            flex: 1;
        }

        /* 标题栏 */
        .panel-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid #f0f5f9;
        }

        .panel-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 32px;
            height: 32px;
            background-color: #334d61;
            color: #fff;
            border-radius: 6px;
            font-weight: bold;
            margin-right: 10px;
        }

        .panel-title {
            font-size: 18px;
            font-weight: 600;
            color: #1D2129;
            display: flex;
            align-items: center;
            margin: 0;
            /* 确保标题居左 */
            justify-content: flex-start;
            width: 100%;
        }

        /* 发帖链接 */
        .post-link {
            color: #334d61;
            text-decoration: none;
            font-size: 13px;
            transition: all 0.3s ease;
            padding: 5px 10px;
            border-radius: 4px;
            background-color: #f0f5f9;
            white-space: nowrap;
        }
        .post-link:hover {
            background-color: #e6eaef;
            color: #283c4d;
        }

        /* 左侧两列文章布局 */
        .article-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 12px 20px;
            height: calc(100% - 52px); /* 减去标题栏高度 */
        }

        /* 单个文章模块 - 缩小高度 */
        .article-item {
            display: flex;
            flex-direction: column;
            padding: 12px;
            border-radius: 6px;
            text-decoration: none;
            transition: all 0.3s ease;
            background-color: #f9fbff;
            height: 100%;
            border: 1px solid #f0f5f9;
            box-sizing: border-box;
        }

        .article-item:hover {
            background-color: #f0f5f9;
            transform: translateY(-2px);
            box-shadow: 0 3px 6px rgba(0,0,0,0.05);
        }

        .article-item .tag {
            font-size: 14px;
            color: #334d61;
            background-color: rgba(51, 77, 97, 0.1);
            padding: 1px 6px;
            border-radius: 3px;
            display: inline-block;
            margin-bottom: 6px;
            width: fit-content;
        }

        .article-item .text {
            font-size: 13px;
            color: #4E5969;
            line-height: 1.5;
            flex-grow: 1;
            margin-bottom: 6px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        /* 文档属性和查看次数 */
        .meta-info {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 11px;
            color: #86909C;
            margin-top: auto;
        }

        .doc-type {
            padding: 1px 5px;
            border-radius: 2px;
            font-weight: 500;
            text-transform: uppercase;
        }

        .doc-type.PDF {
            background-color: rgba(230, 22, 45, 0.1);
            color: #E6162D;
        }

        .doc-type.WORD {
            background-color: rgba(25, 118, 210, 0.1);
            color: #1976D2;
        }

        .doc-type.EXCEL {
            background-color: rgba(7, 193, 96, 0.1);
            color: #07C160;
        }

        .view-count {
            margin: 0 8px;
            white-space: nowrap;
        }

        .article-item .time {
            white-space: nowrap;
        }

        /* 右侧问题列表（带序号） */
        .question-list {
            list-style: none;
            padding: 0;
            margin: 0;
            flex-grow: 1;
        }

        .question-list li {
            display: flex;
            align-items: flex-start;
            padding: 12px 8px;
            border-bottom: 1px solid #F2F3F5;
            transition: background-color 0.3s ease;
        }

        .question-list li:last-child {
            border-bottom: none;
        }

        .question-list li:hover {
            background-color: #f9fbff;
        }

        .question-list li .text {
            font-size: 13px;
            color: #4E5969;
            line-height: 1.5;
            flex-grow: 1;
        }

        /* 排行数字样式 */
        .rank {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            color: #fff;
            font-size: 11px;
            font-weight: bold;
            margin-right: 10px;
            flex-shrink: 0;
            background-color: #86909C;
        }

        /* 前三名颜色区分 */
        .rank.first {
            background-color: #E6162D; /* 红色 */
        }

        .rank.second {
            background-color: #12B7F5; /* 蓝色 */
        }

        .rank.third {
            background-color: #07C160; /* 绿色 */
        }

        /* 更多链接 */
        .more-link {
            text-align: center;
            margin-top: 15px;
        }

        .more-link a {
            display: inline-block;
            color: #334d61;
            text-decoration: none;
            font-size: 13px;
            transition: all 0.3s ease;
            padding: 6px 0;
            border-radius: 4px;
            border: 1px solid #334d61;
            width: 100%;
        }

        .more-link a:hover {
            background-color: #334d61;
            color: #fff;
        }
        
        /* 问答模块样式 */
        .qa-section {
            background-color: #fff;
            margin: 40px auto;
            border-radius: 12px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
            padding: 30px;
        }

        .qa-tab-nav {
            display: flex;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid #F2F3F5;
            padding-bottom: 15px;
            margin-bottom: 20px;
        }

        .tab-container {
            display: flex;
            gap: 25px;
        }

        .qa-tab {
            font-size: 16px;
            color: #4E5969;
            cursor: pointer;
            padding: 8px 0;
            position: relative;
            transition: color 0.3s ease;
        }

        .qa-tab:hover {
            color: #334d61;
        }

        .qa-tab.active {
            color: #334d61;
        }

        .qa-tab.active::after {
            content: '';
            position: absolute;
            bottom: -16px;
            left: 0;
            width: 100%;
            height: 3px;
            background-color: #334d61;
            border-radius: 3px 3px 0 0;
        }

        .more-link {
            font-size: 14px;
            color: #334d61;
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .more-link:hover {
            color: #283c4d;
        }

        .qa-content {
            overflow: hidden;
        }

        .qa-list {
            display: none;
            animation: fadeIn 0.3s ease;
        }

        .qa-list.active {
            display: block;
        }

        /* 问答模块样式增强 */
        .qa-section .qa-list.active {
            display: block !important;
            animation: fadeIn 0.3s ease;
        }

        .qa-section .qa-list {
            display: none !important;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(5px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .qa-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .qa-item {
            background-color: #f9fbff;
            border-radius: 8px;
            padding: 18px;
            transition: all 0.3s ease;
            border: 1px solid transparent;
        }

        .qa-item:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 15px rgba(0,0,0,0.06);
            border-color: #e6f1f8;
        }

        .status-tag {
            display: inline-block;
            padding: 4px 8px;
            border-radius: 4px;
            font-size: 12px;
            font-weight: 500;
            margin-bottom: 8px;
        }
        .status-tag.unsolved { background-color: #1F2D3D; color: #fff; }
        .status-tag.solved   { background-color: #00B050; color: #fff; }
        .status-tag.closed   { background-color: #FF9900; color: #fff; }

        .qa-title {
            font-size: 14px;
            color: #1D2129;
            font-weight: 500;
            margin-bottom: 10px;
            line-height: 1.4;
            height: 44px;
            overflow: hidden;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
        }

        .qa-meta {
            font-size: 12px;
            color: #86909C;
            display: flex;
            justify-content: space-between;
        }
        .category { color: #334d61; font-weight: 500; }

        @media (max-width: 1200px) {
            .qa-grid { grid-template-columns: repeat(3, 1fr); }
        }
        @media (max-width: 768px) {
            .qa-grid { grid-template-columns: repeat(2, 1fr); }
        }
        
        /* 底部样式 */
        .footer-wrapper {
            background-color: #1D2129;
            color: #C9CDD4;
            margin-top: 60px;
            padding: 50px 0 20px;
        }

        .footer-content {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            padding-bottom: 30px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        /* 左侧logo和描述 */
        .footer-left {
            flex: 0 0 280px;
            margin-right: 40px;
        }

        .footer-logo {
            margin-bottom: 15px;
            display: inline-flex;
        }
        .footer-logo img {
  height: 80px;
}

        .footer-logo .logo-text {
            color: #fff;
        }

        .footer-description {
            font-size: 14px;
            line-height: 1.6;
            color: #86909C;
        }

        /* 中间3排导航 */
        .footer-middle {
            display: flex;
            flex: 1;
            min-width: 450px;
            justify-content: space-between;
            gap: 30px; /* 增加导航组之间的间距 */
        }

        .footer-nav-group {
            flex: 1; /* 三栏平均分配宽度 */
            min-width: 120px;
        }

        .nav-title {
            color: #fff;
            font-size: 16px;
            font-weight: 500;
            margin-bottom: 18px;
        }

        .footer-nav {
            list-style: none;
        }

        .footer-nav li {
            margin-bottom: 10px;
        }

        .footer-nav a {
            color: #86909C;
            font-size: 14px;
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .footer-nav a:hover {
            color: #fff;
        }

        /* 右侧二维码区域 */
        .footer-right {
            flex: 0 0 280px;
            display: flex;
            flex-direction: column;
            align-items: center; /* 居中显示 */
        }

        .qrcode-title {
            color: #fff;
            font-size: 16px;
            font-weight: 500;
            margin-bottom: 20px;
            text-align: center;
        }

        .qrcode-container {
            display: flex;
            gap: 25px; /* 二维码之间的间距 */
        }

        .qrcode-item {
            text-align: center;
        }

        .qrcode-item img {
            width: 120px;
            height: 120px;
            background-color: #fff;
            padding: 8px;
            border-radius: 6px;
            margin-bottom: 10px;
        }

        .qrcode-desc {
            font-size: 14px;
            color: #C9CDD4;
        }

        /* 版权信息 */
        .copyright {
            margin-top: 25px;
            text-align: center;
            font-size: 12px;
            color: #86909C;
            line-height: 1.8;
        }

        /* 响应式调整 */
        @media (max-width: 1200px) {
            .footer-content {
                flex-direction: column;
                align-items: center;
            }
            
            .footer-left, .footer-right {
                margin-right: 0;
                margin-bottom: 40px;
                text-align: center;
            }
            
            .footer-middle {
                min-width: 100%;
                margin-bottom: 30px;
            }
        }

        @media (max-width: 768px) {
            .footer-middle {
                flex-wrap: wrap;
            }
            
            .footer-nav-group {
                flex: 0 0 45%;
                margin-bottom: 30px;
            }
            
            .qrcode-container {
                flex-direction: column;
                gap: 20px;
            }
        }